# print(1 + 2 + 3 - 1)
# print(1 + 2 * 3)
# print(1 + 2 / 3)
# print((67.5 + 89.0 + 12.9 + 32.2) / 4)

# 求方差
avg=(67.5 + 89.0 + 12.9 + 32.2) / 4
total=(67.5 - avg) ** 2 + (89.0 - avg) ** 2 + (12.9 - avg) **2 + (32.2 - avg) ** 2
result = total / 4
print(result)